Danielle Snyder's summer job as a babysitter takes a tragic turn when Humphrey, the five-year-old boy she's watching, runs in front of oncoming traffic to chase down his football. Immediately Danielle is caught up in the machinery of tragedy: police investigations, neighborhood squabbling, and, when the driver of the car that struck Humphrey turns out to be an undocumented alien, outsiders use the accident to further a politically charged immigration debate. Wanting only to mourn Humphrey, the sweet kid she had a surprisingly strong friendship with, Danielle tries to avoid the world around her. Through a new relationship with Justin, a boy she meets at the park, she begins to work through her grief, but as details of the accident emerge, much is not as it seems.